Adjustable bench-dog



(No Model.)

H. H. BROCKSMITH. ADJUSTABLE BENCH DOG.

No. 591,618. Patented Oct. 12,1897.

Ta. ..Z V 1 I E =12. I

. hereby declare that the following is a full,

- some kind.

I and the description and claim following.

HERMANN H. BROCKSMITH,

ADJUSTABLE PATENT FFICE.

OF vINcENNEs, INDIANA.

BENCH-DOG.

SPECIFICATION forming part of Letters Patent No. 591,618, dated October12, 1897.

Application filed December 21, 1896.

iSerlal No: 616,373. (No model.)

To all whom it may concern:

Be it known that I, HERMANN H. BROOK- SMITH, of Vincennes, county ofKnox," and State of Indiana, have in vented a certain new and usefulAdjustable Bench-Dog; and I do clear, and exact description thereof,reference being had to the accompanying drawings, in which like figuresrefer to like parts. 7

My invention relates to an adjustable bench-dog for holding one end of aboard on a carpenters bench or other device where such adjustable dogmight be of service. A stationary dog or spur holds what may be calledthe forward end of the board, and since the boards are of varying lengthif one desires to hold the rear end of the board it is necessary toemploy an adjustable dog of My invention to accomplish that object is avery cheap, simple, and efficient device, as will appear from theaccompanying drawings In the drawings, Figure 1 is a perspective of acarpenters bench with a board in place and held by my device. Fig. 2 isaplan view of the bench-dog by itself. Fig. 3 is an end view of Fig. 2,with the position of the parts when the cam lever is elevated shown indotted lines, the cam lever being broken away. Fig. 4 is a cross-sectionon the line 4 4 of Fig. 2.

In detail, 1 represents a carpenters bench which obviously,so far asthis invention is concerned, may be. made in any desirable form. On thetop of the bench at the forward end there is usually placed a stationaryspur or dog 2, which is familiar to all of us, for holding the forwardend of the piece of timber 3 while it is being planed or otherwisetreated. In the other end of the bench'I provide a groove or recess 4,that is parallel with the working side of the bench. It preferablyshould begin at the end of the bench and extend as far as may bedesired. Obviously it should beplaced at the point in the bench wherethe'piece of timber is usually placed while being worked upon. I

My adjustable bench-dog fits and operates in said groove 4. It consistsof a body 5, with a spur on the forward end thereof, and'a pair ofparallel rearward extensions or arms 7, as

seen in Fig. 4. The thickness of the rearward extensions 7 should besuch as not to interfere with their flexibility, so that they may spreadapart at their free ends, as shown in dotted lines in Figs. 2 and 3. Thedimensions of this device should be somewhat less than the dimensions ofthe groove 4 in order that the bench-dog may be easily placed and movedin the groove.

The bench-dog is held in position by sp read- I ing the rearwardextensions 7 within the groove 4, so that they engage tightly with theside walls of said groove. Any suitable means for accomplishing thisspeading may be used, but what I show here I consider preferable. I formthe rearward extensions 7 in crosssection wider at the bottom than atthe-top, as seen in Figs. 3 and 4. About midway or at any desirablepoint I pivot between them a cam-block 8 on the pivot 9. This cam block,when it is turned, as shown in Fig. 3, is wider above than below, asseen in Figs. 3 and 4that is, its width is the converse of that of thespace between the parallel'extensions 7. The cam-block is provided witha lever 10. From this it is obvious that when the cam-block is rotatedfrom the position shown in Fig. 4 to the position shown in dotted linesin Fig. 3, orin Fig. 1, the wider portion of the cam-block is forceddown between the converging inner surfaces of the parallel extensions,whereby they are pressed apart and firmly wedged in the groove 4. Inorder that the parallel arms may be thus pressed apart by the cam-block,the pivot 9 should be so made as to permit such movement-that is, haveat least one end without a head.

From the foregoing description the operation is obvious. A board isplaced against the forward dog 2, the adjustable dog is slipped upagainst the other end of the board, and the cam-lever ll pressed down orrotated until such dog is firmly wedged in the groove. It

is clear, too, that it would hold the timber if such adjustable dog wereelevated so that its upper half, say, would extend above the sur-,

The eolnbinationofabenehhavingagroove press said extensions apart, andmeans for 10 therein, a bench-dog lnovably seated in said rotating saidearn-block.

groove and consisting of a body With a suit- In Witness whereof I havehereunto set my able spur thereon and a pair of extensions hand this 9thday of December, 1896.

5 from said body a cam-block pivoted between 7 n 7 said extensions, thethickness of the caxn- HERMANN BROOKSMI block and of the extensionsWhere said eam- Witnesses: blockis mounted varying in a reverse order,HENRY XV. ALEXANDER,

whereby when the block is rotated it will A. E. I'IUMKE.

